21498842 has 16 divisors (see below), whose sum is σ = 34776000. Its totient is φ = 9934560.

The previous prime is 21498817. The next prime is 21498847. The reversal of 21498842 is 24889412.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a junction number, because it is equal to n+sod(n) for n = 21498796 and 21498805.

It is not an unprimeable number, because it can be changed into a prime (21498847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5342 + ... + 8457.

It is an arithmetic number, because the mean of its divisors is an integer number (2173500).

Almost surely, 2^21498842 is an apocalyptic number.

21498842 is a deficient number, since it is larger than the sum of its proper divisors (13277158).

21498842 is a wasteful number, since it uses less digits than its factorization.

21498842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13861.

The product of its digits is 36864, while the sum is 38.

The square root of 21498842 is about 4636.6843757150. The cubic root of 21498842 is about 278.0598960017.

The spelling of 21498842 in words is "twenty-one million, four hundred ninety-eight thousand, eight hundred forty-two".